本周我开始学习Angular Js和D3 Js。下面的代码可能很可怜,但请耐心等待。
问题:我正在尝试使用一个REST服务,该服务返回json{"chatjson":"[10,20,30]"}。我想用从REST.收到的[10,20,30]画一个饼图
代码概览:我正在使用ng控制器"validateCtrl"中的三个REST服务。两个服务运行良好,以角度显示所需数据,但来自第三个REST(请参阅函数"$scope.getChartData"),它返回{"chatjson":"[10,20,30]"},它是JSON,应该显示基于
处响应的饼图角度代码中的圆环图标签,我没有得到。D3Js代码写在底部。D3代码可以很好地处理硬编码数据。
实际代码
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
<html>
<head>
<script src= "http://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script>
<script src="http://d3js.org/d3.v3.min.js"></script>
</head>
<body>
<h2>Angular Example</h2>
<form ng-app="myApp" ng-controller="validateCtrl"
name="myForm" novalidate>
<p>Username:<br>
<input type="text" name="user" ng-model="user" required>
<span style="color:red" ng-show="myForm.user.$dirty && myForm.user.$invalid">
<span ng-show="myForm.user.$error.required">Username is required.</span>
</span>
</p>
<p>country:<br>
<input type="text" name="country" ng-model="country" required>
<span style="color:red" ng-show="myForm.country.$dirty && myForm.country.$invalid">
<span ng-show="myForm.country.$error.required">country is required.</span>
</span>
</p>
<p>
<input type="submit" value="save" ng-click="send()"
ng-disabled="myForm.user.$dirty && myForm.user.$invalid ||
myForm.country.$dirty && myForm.country.$invalid">
</p>
<ul>
<li ng-repeat="y in detail">
{{ y.name + ', ' + y.country }}
</li>
</ul>
<input type="submit" value="Get Country List" ng-click="getData()">
<input type="submit" value="Get Pie Chart" ng-click="getChartData()">
<ul>
<li ng-repeat="x in names">
{{ x.name + ', ' + x.country }}
</li>
</ul>
<div>
<donut-chart data="chartData"></donut-chart>
</div>
</form>
<script>
var app = angular.module('myApp', []);
app.controller('validateCtrl', function($scope,$http) {
$scope.chartData=[12,13,60]; // Hard coded for testing purpose
$scope.user = 'Anukul';
$scope.country = 'India';
//=============== REST for fetching data from DB for Table details ==============
$scope.getData = function(){
var getApi="http://localhost:9080/nextapp/person/getList";
$http.get(getApi).success(function(response){$scope.names=response.records;
});
};
//=============== REST for fetching data for drawing chart ==============
$scope.getChartData = function(){
var getchartApi="http://localhost:9080/nextapp/person/getChart";
$http.get(getchartApi).success(function(response){$scope.chartData=response;
});
};
//=============== REST for inserting data in DB ==============
$scope.send = function(){
var name = $scope.user;
var country = $scope.country;
var api="http://localhost:9080/nextapp/person/"+name+"/"+country;
$http.get(api)
.success(function(response) {$scope.detail = response.result;});
};
//========== End of REST ==============================
});
//===================== new add for D3 Pie chart ============
app.directive('donutChart',function(){
function link(scope,el){
//---- D3 code goes here
var data = scope.data;
var color = d3.scale.category10()
var el = el[0]
var width = 500
var height = 500
var min = Math.min(width,height)
var pie = d3.layout.pie().sort(null)
var arc = d3.svg.arc()
.outerRadius(125)
.innerRadius(75)
var group = d3.select(el).append('svg')
.attr({width:width,height:height})
.append('g')
.attr('transform','translate('+width/2+','+height/2+')')
var arcs = group.selectAll(".arc")
.data(pie(data))
.enter()
.append('g')
.attr("class","arc")
arcs.append("path")
.attr("d",arc)
.attr("fill",function(d){return color(d.data);});
arcs.append("text")
.attr("transform",function(d){return "translate (" + arc.centroid(d)+")";})
.text(function(d){return d.data;});
//d3.select(el[0]).append('svg')
}
return{
link: link,
restrict:'E',
scope:{data:'='}
}
}
)
</script>
</body>
</html>
我认为主要问题是指令只运行其链接函数一次。问题中发布的代码完成了链接函数中的所有绘图,链接函数只能访问最初的硬编码数据。
因此,解决方案是以一种可以从观察者调用的形式将绘图代码与链接函数分离:
app.directive('donutChart',function(){
function link(scope,element){
scope.el = element[0]; // Cache a reference to the element
draw(scope.data, scope.el); // Initial draw
}
function draw(data, el) {
var color = d3.scale.category10(),
width = 500,
height = 500,
min = Math.min(width,height),
pie = d3.layout.pie().sort(null),
arc = d3.svg.arc()
.outerRadius(125)
.innerRadius(75);
d3.select("svg").remove(); // Clear old pie chart
var group = d3.select(el).append('svg')
.attr({width:width,height:height})
.append('g')
.attr('transform','translate('+width/2+','+height/2+')'),
arcs = group.selectAll(".arc")
.data(pie(data))
.enter()
.append('g')
.attr("class","arc");
arcs.append("path")
.attr("d",arc)
.attr("fill",function(d){return color(d.data);});
arcs.append("text")
.attr("transform",function(d){return "translate (" + arc.centroid(d)+")";})
.text(function(d){return d.data;});
}
return{
link: link,
restrict:'E',
scope:{data:'='},
// Add a controller here to $watch for data changes
controller: function($scope) {
$scope.$watch('data', function(newData) {
draw(newData, $scope.el); // Re-draw the chart
});
}
};
});
我注意到的另一件事可能不是实际的问题,因为它取决于实际的服务器响应。设置图表数据时,您可以执行以下操作:
$scope.chartData = response;
然而,根据你的问题文本,预期的回答是:
{ "chartjson": [10, 20, 30] }
如果是这种情况,并且您的测试图表数据只是一个数组,如图所示:
$scope.chartData = [12, 13, 60];
然后我希望从这样的响应中得到数组:
$scope.chartData = response.chartjson;
你可以在这个plunker中看到,我模拟了$httpBackend
来返回你问题中的示例对象,这似乎很有效。